This is a general tap and is used in all directions. Set Contents: Tip, medium, upper; Accuracy: JIS3 grade; Nominal Size: UNC1/2; Total Length: 3.3 inches (85 mm); Thread Count: 0.4 inches (13 mm); Bottom Hole Diameter: 0.4 inches (10.8 mm); Thread Length: 1.7 inches (42 mm); Shank Diameter: 0.3 inches (9.0 mm); Shaft Diameter: 0 inches (7.7 mm); Processing Screw: Uni-fi inches (7 mm); Surface Treatment: Non-coating; Material: Non-coated : Medium carbon steel, Aluminum alloy etc.